I was dissapointed with the HK and so I upgraded all the HK speakers with bavsound and I also replaced the HK amp with a Bimmertech. Now I feel like the system is a little better than the HK in my prior E90s, which was way better than the HK in the 2er. My advice is listen yourself if you can, but if not save your $ and upgrade the stock system. The Dr. Strangelove thread in this forum is invaluable.
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